Ramularia agrestis Saccardo, 1882

on Viola

Ramularia agrestis on Viola x wittrockiana

Viola x wittrockiana, Belgium, prov. Antwerp, Mol, 16.iv.2017 © Carina Van Steenwinkel

Ramularia agrestis leaf spot

leaf spot with colonies

Ramularia agrestis: conidiophores

conidiopores

Ramularia agrestis: conidia

conidia

parasite

Lead spots and colonies amphigenous. Colonies sometimes so dense as to remind a powdery mildew. Conidia 4-8 x 10-35 µm, 0-1(2)-septate.

host plants

Violaceae, monophagous

Viola altaica, arvensis, dacica, tricolor & subsp. alpestris + macedonica, x wittrockiana.

references

Brandenburger (1985a: 393), Braun (1998a), Ellis & Ellis (1995a), Jage, Kruse, Kummer ao (2013a), Kruse (2014a), Ruszkiewicz-Michalska (2006a), Wołczańska (2005a).

mod 3.vii.2018